Number of permutations of [n] whose lengths of increasing runs are triangular numbers.
A317130
Number of permutations of [n] whose lengths of increasing runs are triangular numbers.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =7a(5) =24a(6) =93a(7) =483a(8) =2832a(9) =17515a(10) =123226a(11) =978405a(12) =8312802a(13) =75966887a(14) =756376739a(15) =8070649675a(16) =91320842018
External references
- oeis: A317130